<template>
  <HomePanel ref="target"
    title="热门品牌"
    sub-title="国际经典 品质保证">
    <template #right>
      <a @click="toggle(0)"
        href="javascript:;"
        class="iconfont icon-angle-left"
        :class="{ disabled: translateX === 0 }"></a>
      <a @click="toggle(-1240)"
        href="javascript:;"
        class="iconfont icon-angle-right"
        :class="{ disabled: translateX === -1240 }"></a>
    </template>
    <div class="box">
      <Transition name="fade">
        <ul class="list"
          v-if="list.length"
          :style="{ transform: `translateX(${translateX}px)` }">
          <li v-for="item in list"
            :key="item.id">
            <RouterLink to="/">
              <img :src="item.picture" />
            </RouterLink>
          </li>
        </ul>
        <div v-else
          class="skeleton">
          <XtxSkeleton class="item"
            v-for="i in 5"
            :key="i"
            animated
            bg="#e4e4e4"
            width="240px"
            height="305px" />
        </div>
      </Transition>
    </div>
  </HomePanel>
</template>

<script>
import { useLazyData } from "@/utils/hooks";
import HomePanel from "./home-panel";
import { getBrand } from "@/api/home";
import { ref } from "vue";
export default {
  name: "HomeBrand",
  components: { HomePanel },
  setup () {
    // 数据
    // 1. 准备API，调用：getBrand(10) 获取十个品牌
    // 2. 使用 useLazyData 函数进行数据懒加载
    // 2.1 传参：你想调用的API函数，不是函数的调用结果（promise）
    // 2.2 返回：target 观察目标元素|组件的数据   list 列表数据
    // 3. 模板元素ref绑定target   使用list数据渲染
    const { target, list } = useLazyData(() => getBrand(10));

    // 切换
    // 1. ul长度 2480 如果想看到右侧的5个品牌，需要ul左移1240
    // 2. 需要一个数据控制ul的位置：位移：0 前五个  位移-1240  后五个
    const translateX = ref(0);
    const toggle = (x) => {
      translateX.value = x;
    };
    return { target, list, translateX, toggle };
  },
};
</script>

<style scoped lang="less">
.home-panel {
  background: #f5f5f5;
}
.iconfont {
  width: 20px;
  height: 20px;
  background: #ccc;
  color: #fff;
  display: inline-block;
  text-align: center;
  margin-left: 5px;
  background: var(--xtx-color);
  &::before {
    font-size: 12px;
    position: relative;
    top: -2px;
  }
  &.disabled {
    background: #ccc;
    cursor: not-allowed;
  }
}
.box {
  display: flex;
  width: 100%;
  height: 345px;
  overflow: hidden;
  padding-bottom: 40px;
  .list {
    width: 200%;
    display: flex;
    transition: all 1s;
    li {
      margin-right: 10px;
      width: 240px;
      &:nth-child(5n) {
        margin-right: 0;
      }
      img {
        width: 240px;
        height: 305px;
      }
    }
  }
}
.skeleton {
  display: flex;
  .xtx-skeleton {
    margin-right: 10px;
    &:nth-child(5n) {
      margin-right: 0;
    }
  }
}
</style>